# AccessDiff

> Know what broke on your website's accessibility this week.

AccessDiff scans your sites every week with automated checks against WCAG 2.2 AA, shows you exactly what changed since last week, and sends a report you can forward to whoever owns the fix. The same scan is available to people in the web app and to agents through the API and MCP server.

## The feature: Site scan

Scans up to 25 pages of a website with automated accessibility checks against WCAG 2.2 AA, stores the snapshot, diffs it against the previous scan of that site and returns the summary with a link to the full report.
- Input: A JSON object with a `siteUrl` string (http or https) and an optional `maxPages` integer (1 to 25, default 25).
- Output: A JSON object with the snapshot summary (score, counts by impact, what changed since the previous scan, pages scanned, top issues) and a signed `reportUrl` to the HTML report (append `/pdf` for the PDF).
- Endpoint: POST https://accessdiff.com/api/v1/scan (JSON in, JSON out; synchronous, one to four minutes)
- Quick scan of one page (about 20 seconds): POST https://accessdiff.com/api/v1/quick-scan with {"url": "..."}
- Auth: Authorization: Bearer <api key> (keys are created by a signed-in person at https://accessdiff.com/app/api-keys)
- Send x-usage-source: agent so usage is attributed to agents (does not change the price)
- Results are issues found by automated checks against WCAG 2.2 AA. Automated checks find a portion of accessibility issues; a review by a person is needed to find the rest. Nothing in a result is legal advice.

## Prices

- Free tier: the instant scan of one page on https://accessdiff.com, no account; no watched sites, no API allowance
- Starter: $49/month or $490/year; 5 watched sites scanned weekly, 40 site scans and 200 quick scans per month through the API, 3 API keys
- Growth: $99/month or $990/year; 25 watched sites scanned weekly, 200 site scans and 1,000 quick scans per month through the API, 10 API keys
- Agency: $149/month or $1,490/year; unlimited watched sites scanned weekly, 2,000 site scans and 5,000 quick scans per month through the API, 25 API keys, white-label reports
- Weekly scans of watched sites are included in every plan and never count against the allowance
- Pay as you go for API and agent calls after a paid plan's allowance is used: $2.00 per site scan (usage event "site_scan") and $0.05 per quick scan (usage event "quick_scan")
- Refunds: any charge within 14 days, no questions asked

## Machine-readable

- OpenAPI 3.1: https://accessdiff.com/api/v1/openapi.json
- Product description (JSON): https://accessdiff.com/.well-known/product.json
- MCP server: see https://accessdiff.com/docs/agent-access (two tools, "scan" and "quick-scan", same schemas as the API)

## Documentation

- https://accessdiff.com/docs/getting-started
- https://accessdiff.com/docs/scanning
- https://accessdiff.com/docs/faq
- https://accessdiff.com/docs/api-keys
- https://accessdiff.com/docs/agent-access
- https://accessdiff.com/docs/billing
- https://accessdiff.com/docs/refunds

## Policies

- Terms: https://accessdiff.com/legal/terms
- Privacy: https://accessdiff.com/legal/privacy
- Refunds: https://accessdiff.com/legal/refunds
- Accessibility: https://accessdiff.com/legal/accessibility
- Support: support@tenhatch.com